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#1 and 3 spark but are black

  1. B

    1982 Honda CB750f #1 and #3 Spark but plug are black

    So I have a freshly rebuild carburetor with bigger jets, running a cognito single air filter and motogadget m-unit brain. For some reason number 1 and 3 are giving me spark but with I pull the plugs its not affecting how the engine runs. Which tells me 1 and 3 arent firing properly. Ive cleaned...
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